From the description provided by Reborn_Jedi, it appears that Walmart has been playing a heavily edited version of the two "Star Wars Connections" videos, which first aired in Australia on the 14th & 21st of April. You can find download instructions for those videos by following the links below:

• Star Wars Connections - Pt 1
  
• Star Wars Connections - Pt 2

The commercial is give or take, about 3 minutes long. It starts off with C-3P0 with R2-D2 by his side, and Threepio introduces himself, and talks of how "Master Luke" told him all about the Jedi and its history. He starts off by explaining the events of Episode I, while clips of the movie are being shown. Then, finally, we get to see NEW clips from Episode II, beginning with (highlight to read) the Obi-Wan and Jango Fett encounter on the landing platform in the rain. We get to see Boba yelling out, "Dad, look!" and then Jango takes aim at Obi-Wan and then jettisons behind a tower.

The next clip features the Obi-Wan / Anakin Skywalker and Zam Wesell speeder chase on Coruscant; we see Obi-Wan freefalling a long way down before being picked up by Anakin on a speeder craft. Obi-Wan exclaims, "What took you so long?" and Anakin responds with "I couldn't find a speeder that I really liked." Then it moves on to the Clone War clips, they are pretty much the same clips that we saw in the 4th official trailer, the Clone War trailer. Near the end of the Episode II clips, (highlight to read) Threepio tells of Anakin going to the Dark Side, while the clips show Anakin fighting Count Dooku in a fierce duel. The Episode II clips end with Anakin in the duel, and immediately cut to the clip from A New Hope, with Darth Vader standing in the Tantive IV, looking for Princess Leia. Then Threepio tells of the Jedi Purge, and how only Obi-Wan and Yoda survived Anakin/Vader's slaughter of the Jedi.

Then he talks about Luke and how he became a hero for the Rebels, and all the while you see clips from A New Hope, The Empire Strikes Back, and Return of the Jedi. It ends with Threepio talking of Anakin bringing balance to the Force, and restoring the Jedi in the form of the New Jedi Order.